The first genus with four sac-like structures in the vulva in the cobweb spider subfamily Theridiinae Sundevall, 1833 (Araneae: Theridiidae)

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  The first genus with four sac-like structures in the vulva in the cobweb spider subfamily Theridiinae Sundevall, 1833 (Araneae: Theridiidae) Abstract The morphological characters of copulatory organs are the most important basis in spiders for identification. In theridiids, a vulva with four sac-like structures is mostly associated with the subfamily Hadrotarsinae but has never been recorded in Theridiinae. Based on specimens collected from subtropical forest canopies in China, a new Theridiinae genus that has four sac-like structures in the vulva is described: Sactheridion gen. nov., with the type species S. chuan gen. & sp. nov. from Sichuan Province, China. Photos, diagnosis, description, and a distribution map of the new genus and new species are provided. Hu, C., Yao, Z., Liu, J. & Xu, X. (2026) The first genus with four sac-like structures in the vulva in the cobweb spider subfamily Theridiinae Sundevall, 1833 (Araneae: Theridiidae). Zootaxa, 5884 (1), 167–175. http...

Revision of the South American Ninetinae genus Guaranita (Araneae, Pholcidae)

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Revision of the South American Ninetinae genus Guaranita (Araneae, Pholcidae)

Abstract


The southern South American genus Guaranita includes tiny spiders (body length ~1 mm) that lead reclusive lives under ground-objects and run rapidly when disturbed.  As a  result,  they have been poorly collected and studied.  Here we report on a  recent collection of  Guaranita spiders from  Argentina, describing one new species (G. auadae Huber sp. nov.) and the previously unknown female of G. dobby Torres et al., 2016. In addition, we provide CO1 barcodes for all (now five) known species, first SEM data, and first chromosome data for the genus. The diploid number of GuaranitagoloboffiHuber, 2000 (2n♂ = 11) is among the lowest in araneomorph spiders with monocentric chromosome structure.


Huber, B. A., Meng, G., Král, J., Ávila Herrera, I. M., & Izquierdo, M. A. (2023). Revision of the South American Ninetinae genus Guaranita (Araneae, Pholcidae). European Journal of Taxonomy, 900(1), 32–80. https://doi.org/10.5852/ejt.2023.900.2301